IRS31Pro-UMB
Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH
16
7.2.1.1 Extension Table for IRS31Pro-UMB Passive Road Sensor
Total
Distance
RS485
Terminator
Required
IRS31Pro-
UMB
Original
Cable
Extension Cable
A-2ZF(L)2Z
N
x2x0.8
Wire
Range
0.5mm
2
0.8mm
2
Power Supply
Wire Bundle
Total Wire
Pairs
[m]
max. [m]
up to…[m]
x times
N
100
-
100
--
--
200
-
50
150
3x
4
300
-
50
250
4x
6
400
YES
50
350
6x
10
500
YES
50
450
7x
10
600
YES
50
550
9x
10
700
YES
50
650
10x
20
800
YES
50
750
11x
20
900
YES
50
850
13x
20
1000
YES
50
950
14x
20
1100
YES
50
1050
16x
20
1200
YES
50
1150
17x
20
Notes:
Recommended extension cable: A-2YF(L)2Y Nx2x0, 8 or similar;
Core pair 2x (2 times) means 2 pairs of wires, e.g. 2x2x0.8, because 2 individual wires are 1 pair for the
power supply (+ & -).
RS485 termination resistance required means that a resistance of 120 ohms should be connected parallel
to the RS485 2-wire interface, either on the sensor inlet or sleeve.
7.3
Connecting the Supply Cable
The road sensor supply cable is connected to the power supply and the bus system (e.g. ISOCON-UMB)
in the control panel.
The data lines and the supply voltage of each IRS31Pro-UMB must be electrically isolated from
each other. This can be achieved for example by means of a LUFFT ISOCON-UMB. If the sensor is
operated without electrical isolation, the sensor may be destroyed and the warranty expires!
The screening of the connecting cable MUST be laid to earth in the control panel! Under no
circumstances is it allowed to connect the negative supply voltage (GND1) with the cable shield
(connected to earth) of the sensor.
For Sensors with 12 VDC power supply the end of the cable in the cabinet is marked by the
manufacturer with a red heat shrink tubing!
